Marking material



. PM... Sept. 1, 1942 mm; MATERIAL Harry-W. Helmer and-Vlnton Staley, Chicago,

Ill., assignors' to Helmer-Staley, Inc., Chicago, 111., a corporation of Illinois No Drawing.

Application Marci. is, 1939, Serial No. zsznoe Claims'. (01.106-19) invention relates to solid implements for marking hot surfaces or surfaces tobe heated. and more specifically relatesto solid marking sticks or pencils composed of a pigment, a vehicle,

I v and a heat-resisting setting agent.

The markingof hot surfaces, or surfaces to.

'7 be heated such as metal sheets, billets,.castings,

. forgings and the like with identifying data is a I troublesome problem in many industries.- Fbr erample, batches of metal. sheets, billets, castlugs, and the like have a known analysis or designation at the time they are made. Data concerning such analysis or designation, such as a code, color or the like. must be marked on the -metal before it has cooled down. Some of the marked metal may then be mixedwith metal from other batches and stored for future use.

Other metal objects from the-same batch may be immediately used or further processed.

The identifying marking on the surface must be clear and permanent enough to withstand handling, weather conditionsand thelike, and yet not damage the surface by etching the same.

agent. While the vehicle may volatilize or. distill of! at higher temperatures, the distillation point should be above the melting point of the setting agent. The vehicle is thus active in flowing'pigment and setting agent onto hot surfaces at relatively low temperatures. If the surfaces are heated to temperatures above the distillationpoint of the vehicle, the vehicle will boil off, but,

before it leaves the marking, the setting agent will be in a molten condition toanchor the pigs ment.

We have found that/solid: halogenated asmatic organic compounds such as chlorinated naphthalenes are excellent vehiclesfor'the pig- .hexachloronaphthalene, for example, can be It is sometimes desirable that the marking be removable in picklingbaths and the like because, by the time the marked metal objects, reach this.

classified and segregated for a particular use.-

- We have'now provided neutral solid sticks or pencils capable of leaving identifying markings on cold or hot surfaces. The markings will withstand temperatures as high as 1800 F. and .will not flake off by mechanical'acti'on at any temperature. The'markingsticks'or-pencils of this to temperatures to produce a plastic mass. The

-ment as well as bonding'agents for the sticks.

Chlorinated naphthalenes known commercially as Halowaxesf are operativea A Halowax such as tetrachloronaphthalene' .having'a flow point of 270-280 F. and a boiling.

or distilling range of 680-330 E'has' been found with great success... Other Halowaxes, such as used I um nitrate, m ith; pm of 600- f F is a very satisfactoryheat-resisting setting agent for use in combination with the Halowax. stage in an, industrial process, they are already It should be noted that the melting point of the sodium nitrate is slightly below the distillation.

point of the Haiowax, so that the setting" agent is in a molten condition. beforexthe Halowax disvide solid marking implements suitable for marking surfaces throughout a wide range of plastic mass is then extruded through a die into' the desired shape. Upon cooling, a hard mark ing implement of the desired shape is formed.

We have foimd that solid sticks or pencilscapable of marking cold surfaces orsurfaces In general, the vehicle used should be solid at room temperatures and melt at temperatures below the melting point of the mark-setting 65 he'atedashighasl800'l.canbemadefromaresisting markings thereon which are readily re-- moved when the metal surfaces are pickled.

The preferred setting agent su ine men to give free-flowing liquids. partof which r'esist volatilization at the temperatures of the hot surfaces.- 1 W It is, then an object of this invention to protemperatures without damaging the surfaces.

I Another object of the invention is to provide neutral solid marking sticks or pencils capable) of producing markings on hot surfaces without etching the surfaces.

A further object of the invention is to provide solid marking implements for use in marking hot metal surfaces to leave weather and wear- A specific object of the invention is to provide. a neutral solid marking implement composed of a pigment, a halogenated aromatic organic compound, and an inorganic, heat-resisting setting agent for the pigment.

Another specific object of the invention is to provide a solid markingimpiement composed of a pigment. tetrachloronaphthalene. and a neutral 5 cred markings. Aiternativeiy,other.white or colcred pigments can be used-in place oi the Ti Y potassium nitrate. fl'he' halogenated aromatieorganic compound selected should be solid. at room inorganic nitrate salt.

spasms j Other and iurther objects oi invention will be apparent from the following examples'which iilustratepreierred embodiments of the invention: Example I 2 parts by weight of powdered tetrachloro-w naphthalene -are admixed with 2% parts by "weight of powdered 'Iltanox and 2 parts by weight of powdered sodium nitrate.

iormly 'mixed'powderedmass-is then heated to about 13 C; (268. E)" for. producing a plastic The unimass Theplastic mass-is then extruded through a mold of the desired diameter to produce chi-elongated rod. The rodls-cut-into sticks of j; the desired length. The sticks are allowed to cool andsolidiim'and ,are' then ready for packaging."

j J In the; above example the .tetrachloronaphtha- '-'ienecontent, mayvary from 1% parts to 2% parts-by weight. ogTheisodium nitratecontent may be increasedtod b parts .by weight if de- The Tltanox is a white pigment comprising tidioxide together with a filler such as sulfate or calcium sulfate and produces awhite' marking stick leaving a white mark. Ii

- Example!!! Borax Halowax Y 1% Pigment The above ingredients are mixed together to produce a uniformly powdered mass. The powdered mass is then heated. to partially. fuse the same and the resulting plastic materlalliszmoided by extrusion or casting into sticksoi the desired? size and shape.

1800 I". can be marked with wear and weather-.-

It will, oi course; be understood that various details oij the product and process may be varied through a wide range without departing from the principles of this invention and it is, therefore, not the purpose to limit the patent granted here-- desired. coloring materialssuch as carbon black, Y

1 iron pigment. cobalt pigment, chromium pigment,

aud the like canbe addedto the powdered mixhire for producing colored sticks which leave colteatime-i 3% parts by weight'of a powdered halogenglgdilm aromatic organic compound are admixed with 2% parts by weight of powdered Titanox or other":

-pigment, and 2% parts by weight of powdered-- temperatures and have a melting point below melting point of the potassium nitrate.

i v Theuniiormly mixed mass is heated to render the same somewhat plastic. The plastic mass is then cast into molds oi the desired shape and on otherwise than necessitated by the scope of the appended claims.

We claim:

1. A solid marking implement adapted; for

marking or hot metals which comprises a P g-r ment, in neutral meltable solid halogenated. aromatic organic compoundcapable otdistilling at}, elevated. temperatures and a neutralv heabresish mg pigment-setting agent selectedirom the group consisting oi! borax ,and inorganic nitrate jfg 2. A marking stick' adapted' 'ior marking hot metals which comprises .'a pigment, a heiowax inorganic nitrate salt. l r i 3. A marking stick for marking hot metal "laces-to leavea wear-resisting mark thereon re- -movable in a pickling bath for the metal. which comprises a titanium dioxide pigment, tetra *chioronaphthalene and sodium nitrate. Y wdaA'solid marking. stick for the marking at hot surfacesoomposed cite to 2 /2 parts by f'weight oftetrachioronaphthalene; 2 to 2V: parts sine. Molding wheels having mating semi-cylin'- dri'cal notches in their peripheries can .beused 1 lot the casting'operation. --The plastic mass is;

by weight oi sodium nitrate and 2 parts by {weight of a titanium dioxide-pigment. 1 5. The method oi making marking stickswhich comprisesuniformly mixing together powdered introduced intothe' nip or bite between the rolls andcompressed m the notches of the roll pe-' .ripheries to form the desired molded articlei {@Aiter cooling, solid sticks are produced. I The 'Titanox specified in the above example be substituted inwhole or in part with other v pigments or other coloring materials toprod'uce de siredshadesorcolors.'-

pigment. powdered tetrachloronaphthalene and powdered sodium nitrate, heating the mixture to about 130'. C. to torm-a plastic mass, extruding the mass into a rod shape. cutting oi! sticks'oi 1 desired length from e rod,'-anda llowin8.

sticks retool; Y a w 

